Well since i have the M24 platinum, i think i should chime in a little bit here. Im not whatsoever a quickscope pro or anything. I enjoy doing it time to time just because its lots of lols and sometimes some pro montage shots. But i have had extensive time with the rifle and figuring out what other stats are to compare them. So this is what i found.
First off, lets start with the what i call, annoying snipers. The SVU, T88, And VSS. Why do i call them annoying? Because i tend to get into gun fights with people that use them and loose just because of their sheer power over my assault rifle, or when i go for objectives and they can put down my whole team there in seconds.
Their stats are actually the same as the M14 mod. If you compare there stats to it, they have the same. Minus the VSS. But the SVU and T88 have the same stats as the M14 Mod. So if your using a 4x on the T88 and running up close, minus the fact that u can use motion balls, you might want to switch to assault with a M14 or medic or some other class because it has the same stats. The M14 (On hardcore) is a 1 shot kill chest and up at any range. The gun seems to have very little drop. On Valpraiso defending my friend anti sniped someone sitting ontop the lighthouse from the spawn before last as defenders with it. Its a pretty accurate gun so if you are using the T88 and are up close, see about giving it a try. SVU is the same stats just silenced.
Ok so now onto my pride and joy, M24. Again, i play hardcore mode so motion sensors arnt much help to me so that whole helping out squad thing is mostly diminished with playing hardcore so they usually go behind me or around me if im sitting in a spot for a little while so i dont get flanked.
My setup is usually M24 with 4x and mag ammo and mortars. Mortars are usually used if i find those pesky snipers that like to sit behind rocks or for when i want to move and i know where people are going to be looking, i drop them to create smoke or drop them closer to create that annoying bouncing of their screens so i can move without being accurately shot at. If im defending and there are tanks and ground vehicles i sometimes switch to C4 so i can help take those out if i get the chance.
What i tend to see with the M24 is that if you are about 50m away, if you put the reticle tip right at their head or close to it, you end up getting a kill shot. (Note: This is hardcore and i dont trace my bullets so it might be limb or lower shots) But up close i tend to just try and run around with my pistol out or if im going to try and get the guy with a quick scope, keep an eye on where my gun will shoot and try and put that where i think he is going to be while running so if i have to scope in i can make little adjustment and it will be right on him.
Reloading. As its said before, you can still do the trick where your mag will be full before the animation and you can double tap Y to end it and have your few seconds. I usually reload if i have to drop down to cover after shooting a few miss shots or a few kill shots i usually drop down into cover and reload. Whenever i have to drop down, i reload. (Given i always have a motion mine right next to my spot so i know if someone is coming so i know im ok to reload) Also, if im running from cover to cover, and i know it will be safe or really short time im exposed, ill reload during that too. I tend to make my reloads or try to, make them at times where i will not be engaged or engaging enemies. So that when i have to, i have that full mag to use if needed.
Its all about what you feel comfortable with. I got to know the M24 as my first quick scoping sniper. I have recently been trying to use the GOL, and all thats happening is me using my pistol because i cant get the shots. Its all muscle memory and figuring out where the reticle has to be for the shot with that gun.
Whatever is comfortable for you, use it. If you have spare time and want to try something new, dont get upset if it doesnt work right away. It takes time to learn how the gun will react, where you have to shoot, how fast it shoots, how much you need to put into them to put them down, etc. I went from using the M14 mod to using regular automatic assault rifles and had to re learn how to tap fire and how much to tap fire to put them down. Again with going to using LMG's, had to re learn how much to tap fire with the MG36 and where to put the reticle to get the headshots and the nice bursts that will recoil up to get me the headshots.
Practices makes perfect, practices with the guns and you will find out what works. As a suggestion, if you want to practice with stuff. Play Conquest on Arica Harbor. Its a 350 ticket game and is a small map to play on in conquest. Usually can rack up somewhere between 25 and 30 kills atleast. Aslong as you dont have a lobby with those pesky snipers sitting in spawn and dropping mortars on all the buildings the whole game
If anyone wants any more help im more than willing to run with them and help them. Again, im not an expert nor even close to being an expert at quick scoping but i did learn some things about it that i can share.
Hope this helped you, sorry for the long post =]